From: Hans Verkuil <hansverk@xxxxxxxxx>
Add CEC support to the adv7604 driver.
Signed-off-by: Hans Verkuil <hansverk@xxxxxxxxx>
[k.debski@xxxxxxxxxxx: Merged changes from CEC Updates commit by Hans Verkuil]
Signed-off-by: Kamil Debski <k.debski@xxxxxxxxxxx>
---
drivers/media/i2c/adv7604.c | 182 +++++++++++++++++++++++++++++++++++++++++++
1 file changed, 182 insertions(+)
diff --git a/drivers/media/i2c/adv7604.c b/drivers/media/i2c/adv7604.c
index aaab9c9..ce9d123 100644
--- a/drivers/media/i2c/adv7604.c
+++ b/drivers/media/i2c/adv7604.c
@@ -42,6 +42,7 @@
#include <media/v4l2-device.h>
#include <media/v4l2-dv-timings.h>
#include <media/v4l2-of.h>
+#include <media/cec.h>
static int debug;
module_param(debug, int, 0644);
@@ -159,6 +160,10 @@ struct adv76xx_state {
u16 spa_port_a[2];
struct v4l2_fract aspect_ratio;
u32 rgb_quantization_range;
+ u8 cec_addr[3];
+ u8 cec_valid_addrs;
+ bool cec_enabled_adap;
+
struct workqueue_struct *work_queues;
struct delayed_work delayed_work_enable_hotplug;
bool restart_stdi_once;
@@ -1862,6 +1867,176 @@ static int adv76xx_set_format(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh,
return 0;
}
+static void adv7604_cec_tx_raw_status(struct v4l2_subdev *sd, u8 tx_raw_status)
+{
+ if ((cec_read(sd, 0x11) & 0x01) == 0) {
+ v4l2_dbg(1, debug, sd, "%s: tx raw: tx disabled\n", __func__);
+ return;
+ }
+
+ if (tx_raw_status & 0x02) {
+ v4l2_dbg(1, debug, sd, "%s: tx raw: arbitration lost\n", __func__);
+ v4l2_subdev_notify(sd, V4L2_SUBDEV_CEC_TX_DONE, (void *)CEC_TX_STATUS_ARB_LOST);
+ return;
+ }
+ if (tx_raw_status & 0x04) {
+ v4l2_dbg(1, debug, sd, "%s: tx raw: retry failed\n", __func__);
+ v4l2_subdev_notify(sd, V4L2_SUBDEV_CEC_TX_DONE, (void *)CEC_TX_STATUS_RETRY_TIMEOUT);
+ return;
+ }
+ if (tx_raw_status & 0x01) {
+ v4l2_dbg(1, debug, sd, "%s: tx raw: ready ok\n", __func__);
+ v4l2_subdev_notify(sd, V4L2_SUBDEV_CEC_TX_DONE, (void *)CEC_TX_STATUS_OK);
+ return;
+ }
+}
+
+static void adv7604_cec_isr(struct v4l2_subdev *sd, bool *handled)
+{
+ struct cec_msg msg;
+ u8 cec_irq;
+
+ /* cec controller */
+ cec_irq = io_read(sd, 0x4d) & 0x0f;
+ if (!cec_irq)
+ return;
+
+ v4l2_dbg(1, debug, sd, "%s: cec: irq 0x%x\n", __func__, cec_irq);
+ adv7604_cec_tx_raw_status(sd, cec_irq);
+ if (cec_irq & 0x08) {
+ msg.len = cec_read(sd, 0x25) & 0x1f;
+ if (msg.len > 16)
+ msg.len = 16;
+
+ if (msg.len) {
+ u8 i;
+
+ for (i = 0; i < msg.len; i++)
+ msg.msg[i] = cec_read(sd, i + 0x15);
+ cec_write(sd, 0x26, 0x01); /* re-enable rx */
+ v4l2_subdev_notify(sd, V4L2_SUBDEV_CEC_RX_MSG, &msg);
+ }
+ }
+
+ /* note: the bit order is swapped between 0x4d and 0x4e */
+ cec_irq = ((cec_irq & 0x08) >> 3) | ((cec_irq & 0x04) >> 1) |
+ ((cec_irq & 0x02) << 1) | ((cec_irq & 0x01) << 3);
+ io_write(sd, 0x4e, cec_irq);
+
+ if (handled)
+ *handled = true;
+}
+
+static int adv7604_cec_enable(struct v4l2_subdev *sd, bool enable)
+{
+ struct adv7604_state *state = to_state(sd);
+
+ if (!state->cec_enabled_adap && enable) {
+ cec_write_and_or(sd, 0x2a, 0xfe, 0x01); /* power up cec */
+ cec_write(sd, 0x2c, 0x01); /* cec soft reset */
+ cec_write_and_or(sd, 0x11, 0xfe, 0); /* initially disable tx */
+ /* enabled irqs: */
+ /* tx: ready */
+ /* tx: arbitration lost */
+ /* tx: retry timeout */
+ /* rx: ready */
+ io_write_and_or(sd, 0x50, 0xf0, 0x0f);
+ cec_write(sd, 0x26, 0x01); /* enable rx */
+ } else if (state->cec_enabled_adap && !enable) {
+ io_write_and_or(sd, 0x50, 0xf0, 0x00); /* disable cec interrupts */
+ cec_write_and_or(sd, 0x27, 0x8f, 0x70); /* disable address mask 1-3 */
+ cec_write_and_or(sd, 0x2a, 0xfe, 0x00); /* power down cec section */
+ state->cec_valid_addrs = 0;
+ }
+ state->cec_enabled_adap = enable;
+ return 0;
+}
+
+#define ADV7604_MAX_ADDRS (3)
+
+static int adv7604_cec_log_addr(struct v4l2_subdev *sd, u8 addr)
+{
+ struct adv7604_state *state = to_state(sd);
+ unsigned i, free_idx = ADV7604_MAX_ADDRS;
+
+ if (!state->cec_enabled_adap)
+ return -EIO;
+
+ for (i = 0; i < ADV7604_MAX_ADDRS; i++) {
+ bool is_valid = state->cec_valid_addrs & (1 << i);
+
+ if (free_idx == ADV7604_MAX_ADDRS && !is_valid)
+ free_idx = i;
+ if (is_valid && state->cec_addr[i] == addr)
+ return 0;
+ }
+ if (i == ADV7604_MAX_ADDRS) {
+ i = free_idx;
+ if (i == ADV7604_MAX_ADDRS)
+ return -ENXIO;
+ }
+ state->cec_addr[i] = addr;
+ state->cec_valid_addrs |= 1 << i;
+
+ switch (i) {
+ case 0:
+ /* enable address mask 0 */
+ cec_write_and_or(sd, 0x27, 0xef, 0x10);
+ /* set address for mask 0 */
+ cec_write_and_or(sd, 0x28, 0xf0, addr);
+ break;
+ case 1:
+ /* enable address mask 1 */
+ cec_write_and_or(sd, 0x27, 0xdf, 0x20);
+ /* set address for mask 1 */
+ cec_write_and_or(sd, 0x28, 0x0f, addr << 4);
+ break;
+ case 2:
+ /* enable address mask 2 */
+ cec_write_and_or(sd, 0x27, 0xbf, 0x40);
+ /* set address for mask 1 */
+ cec_write_and_or(sd, 0x29, 0xf0, addr);
+ break;
+ }
+ return 0;
+}
+
+static int adv7604_cec_transmit(struct v4l2_subdev *sd, struct cec_msg *msg)
+{
+ u8 len = msg->len;
+ unsigned i;
+
+ if (len == 1)
+ cec_write_and_or(sd, 0x12, 0xf8, 1); /* allow for one retry for polling */
+ else
+ cec_write_and_or(sd, 0x12, 0xf8, 3); /* allow for three retries */
+
+ if (len > 16) {
+ v4l2_err(sd, "%s: len exceeded 16 (%d)\n", __func__, len);
+ return -EINVAL;
+ }
+
+ /* write data */
+ for (i = 0; i < len; i++)
+ cec_write(sd, i, msg->msg[i]);
+
+ /* set length (data + header) */
+ cec_write(sd, 0x10, len);
+ /* start transmit, enable tx */
+ cec_write(sd, 0x11, 0x01);
+ /* For some reason sometimes the
+ * transmit won't start.
+ * Doing it twice seems to help ?
+ */
+ cec_write(sd, 0x11, 0x01);
+ return 0;
+}
+
+static void adv7604_cec_transmit_timed_out(struct v4l2_subdev *sd)
+{
+ cec_write_and_or(sd, 0x11, 0xfe, 0); /* disable tx */
+}
+
static int adv76xx_isr(struct v4l2_subdev *sd, u32 status, bool *handled)
{
struct adv76xx_state *state = to_state(sd);
@@ -1907,6 +2082,9 @@ static int adv76xx_isr(struct v4l2_subdev *sd, u32 status, bool *handled)
*handled = true;
}
+ /* cec */
+ adv7604_cec_isr(sd, handled);
+
/* tx 5v detect */
tx_5v = io_read(sd, 0x70) & info->cable_det_mask;
if (tx_5v) {
@@ -2301,6 +2479,10 @@ static const struct v4l2_subdev_video_ops adv76xx_video_ops = {
.s_dv_timings = adv76xx_s_dv_timings,
.g_dv_timings = adv76xx_g_dv_timings,
.query_dv_timings = adv76xx_query_dv_timings,
+ .cec_enable = adv7604_cec_enable,
+ .cec_log_addr = adv7604_cec_log_addr,
+ .cec_transmit = adv7604_cec_transmit,
+ .cec_transmit_timed_out = adv7604_cec_transmit_timed_out,
};
static const struct v4l2_subdev_pad_ops adv76xx_pad_ops = {
--
1.7.9.5
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